class Query

1. 11.x core/modules/workspaces/src/EntityQuery/Query.php \Drupal\workspaces\EntityQuery\Query
2. 11.x core/lib/Drupal/Core/Config/Entity/Query/Query.php \Drupal\Core\Config\Entity\Query\Query
3. 11.x core/lib/Drupal/Core/Database/Query/Query.php \Drupal\Core\Database\Query\Query
4. 11.x core/lib/Drupal/Core/Entity/Query/Sql/Query.php \Drupal\Core\Entity\Query\Sql\Query
5. 11.x core/lib/Drupal/Core/Entity/Query/Null/Query.php \Drupal\Core\Entity\Query\Null\Query
6. 11.x core/lib/Drupal/Core/Entity/KeyValueStore/Query/Query.php \Drupal\Core\Entity\KeyValueStore\Query\Query
7. 10 core/modules/workspaces/src/EntityQuery/Query.php \Drupal\workspaces\EntityQuery\Query
8. 10 core/lib/Drupal/Core/Config/Entity/Query/Query.php \Drupal\Core\Config\Entity\Query\Query
9. 10 core/lib/Drupal/Core/Database/Query/Query.php \Drupal\Core\Database\Query\Query
10. 10 core/lib/Drupal/Core/Entity/Query/Sql/Query.php \Drupal\Core\Entity\Query\Sql\Query
11. 10 core/lib/Drupal/Core/Entity/Query/Null/Query.php \Drupal\Core\Entity\Query\Null\Query
12. 10 core/lib/Drupal/Core/Entity/KeyValueStore/Query/Query.php \Drupal\Core\Entity\KeyValueStore\Query\Query
13. 9 core/modules/workspaces/src/EntityQuery/Query.php \Drupal\workspaces\EntityQuery\Query
14. 9 core/lib/Drupal/Core/Config/Entity/Query/Query.php \Drupal\Core\Config\Entity\Query\Query
15. 9 core/lib/Drupal/Core/Database/Query/Query.php \Drupal\Core\Database\Query\Query
16. 9 core/lib/Drupal/Core/Entity/Query/Sql/Query.php \Drupal\Core\Entity\Query\Sql\Query
17. 9 core/lib/Drupal/Core/Entity/Query/Null/Query.php \Drupal\Core\Entity\Query\Null\Query
18. 9 core/lib/Drupal/Core/Entity/KeyValueStore/Query/Query.php \Drupal\Core\Entity\KeyValueStore\Query\Query
19. 8.9.x core/modules/workspaces/src/EntityQuery/Query.php \Drupal\workspaces\EntityQuery\Query
20. 8.9.x core/lib/Drupal/Core/Config/Entity/Query/Query.php \Drupal\Core\Config\Entity\Query\Query
21. 8.9.x core/lib/Drupal/Core/Database/Query/Query.php \Drupal\Core\Database\Query\Query
22. 8.9.x core/lib/Drupal/Core/Entity/Query/Sql/Query.php \Drupal\Core\Entity\Query\Sql\Query
23. 8.9.x core/lib/Drupal/Core/Entity/Query/Null/Query.php \Drupal\Core\Entity\Query\Null\Query
24. 8.9.x core/lib/Drupal/Core/Entity/KeyValueStore/Query/Query.php \Drupal\Core\Entity\KeyValueStore\Query\Query

SelectQuery::preExecute in includes/database/select.inc

Generic preparation and validation for a SELECT query.

system_update_7076 in modules/system/system.install

Convert menu_links query strings into arrays.

_drupal_decode_exception in includes/errors.inc

Decodes an exception and retrieves the correct caller.

abstract class Query  implements QueryPlaceholderInterface {
 
 /**
 * The connection object on which to run this query.
 *
 * @var DatabaseConnection
 */
 protected $connection;
 
 /**
 * The target of the connection object.
 *
 * @var string
 */
 protected $connectionTarget;
 
 /**
 * The key of the connection object.
 *
 * @var string
 */
 protected $connectionKey;
 
 /**
 * The query options to pass on to the connection object.
 *
 * @var array
 */
 protected $queryOptions;
 
 /**
 * A unique identifier for this query object.
 */
 protected $uniqueIdentifier;
 
 /**
 * The placeholder counter.
 */
 protected $nextPlaceholder = 0;
 
 /**
 * An array of comments that can be prepended to a query.
 *
 * @var array
 */
 protected $comments = array();
 
 /**
 * Constructs a Query object.
 *
 * @param DatabaseConnection $connection
 * Database connection object.
 * @param array $options
 * Array of query options.
 */
 public function __construct(DatabaseConnection $connection, $options) {
 $this->uniqueIdentifier  = uniqid ('', TRUE);
 $this->connection  = $connection;
 $this->connectionKey  = $this->connection 
 ->getKey ();
 $this->connectionTarget  = $this->connection 
 ->getTarget ();
 $this->queryOptions  = $options;
 }
 
 /**
 * Implements the magic __sleep function to disconnect from the database.
 */
 public function __sleep() {
 $keys = get_object_vars ($this);
 unset($keys['connection']);
 return array_keys ($keys);
 }
 
 /**
 * Implements the magic __wakeup function to reconnect to the database.
 */
 public function __wakeup() {
 $this->connection  = Database ::getConnection ($this->connectionTarget , $this->connectionKey );
 }
 
 /**
 * Implements the magic __clone function.
 */
 public function __clone() {
 $this->uniqueIdentifier  = uniqid ('', TRUE);
 }
 
 /**
 * Runs the query against the database.
 */
 abstract protected function execute();
 
 /**
 * Implements PHP magic __toString method to convert the query to a string.
 *
 * The toString operation is how we compile a query object to a prepared
 * statement.
 *
 * @return
 * A prepared statement query string for this object.
 */
 abstract public function __toString();
 
 /**
 * Returns a unique identifier for this object.
 */
 public function uniqueIdentifier() {
 return $this->uniqueIdentifier ;
 }
 
 /**
 * Gets the next placeholder value for this query object.
 *
 * @return int
 * Next placeholder value.
 */
 public function nextPlaceholder() {
 return $this->nextPlaceholder ++;
 }
 
 /**
 * Adds a comment to the query.
 *
 * By adding a comment to a query, you can more easily find it in your
 * query log or the list of active queries on an SQL server. This allows
 * for easier debugging and allows you to more easily find where a query
 * with a performance problem is being generated.
 *
 * The comment string will be sanitized to remove * / and other characters
 * that may terminate the string early so as to avoid SQL injection attacks.
 *
 * @param $comment
 * The comment string to be inserted into the query.
 *
 * @return Query
 * The called object.
 */
 public function comment($comment) {
 $this->comments [] = $comment;
 return $this;
 }
 
 /**
 * Returns a reference to the comments array for the query.
 *
 * Because this method returns by reference, alter hooks may edit the comments
 * array directly to make their changes. If just adding comments, however, the
 * use of comment() is preferred.
 *
 * Note that this method must be called by reference as well:
 * @code
 * $comments =& $query->getComments();
 * @endcode
 *
 * @return
 * A reference to the comments array structure.
 */
 public function &getComments() {
 return $this->comments ;
 }
}